package allegro5

// #include <allegro5/allegro.h>
import "C"

import (
	"fmt"
	"unsafe"
)

// Display represents a display
type Display struct {
	display *C.ALLEGRO_DISPLAY
}

type NewDisplayOptions struct {
	Width      int
	Height     int
	Fullscreen bool
	Resizable  bool
	Windowed   bool
}

// NewDisplay creates a display
func NewDisplay(options NewDisplayOptions) (*Display, error) {
	var flags C.int = C.ALLEGRO_WINDOWED
	if options.Fullscreen {
		if options.Windowed {
			flags |= C.ALLEGRO_FULLSCREEN_WINDOW
		} else {
			flags = C.ALLEGRO_FULLSCREEN
		}
	}
	if options.Resizable {
		flags |= C.ALLEGRO_RESIZABLE
	}
	C.al_set_new_display_flags(flags)
	d := C.al_create_display(C.int(options.Width), C.int(options.Height))
	if nil == d {
		return nil, fmt.Errorf("Error creating display")
	}
	return &Display{d}, nil
}

// Flips flips the buffer to the display
func (d *Display) Flip() {
	C.al_flip_display()
}

func (d *Display) Width() int {
	return int(C.al_get_display_width(d.display))
}

func (d *Display) Height() int {
	return int(C.al_get_display_height(d.display))
}

func (d *Display) SetWindowTitle(title string) {
	t := C.CString(title)
	defer C.free(unsafe.Pointer(t))
	C.al_set_window_title(d.display, t)
}

// Destroy destroys the display
func (d *Display) Destroy() {
	C.al_destroy_display(d.display)
}

func SetNewWindowTitle(title string) {
	t := C.CString(title)
	defer C.free(unsafe.Pointer(t))
	C.al_set_new_window_title(t)
}